@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:A4hKYJzt+FJSmDjlOMpzRfrCLnrNXYVRgrv78c78g2I.
Please contact your system administrator.
Add correct host key in /var/root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /var/root/.ssh/known_hosts:4
ECDSA host key for 192.168.14.45 has changed and you have requested strict checking.
Host key verification failed.
当client通过ssh连接server时，会把server的信息保存在自己家目录下的.ssh/known_hosts文件里。如果server被重装或者被替换（IP没变），server的信息肯定就改变了，与之前known_hosts里的信息不一致，从而导致密钥认证失败。
通过sudo su 进入到管理员用户
在管理员用户下vim ~/.ssh/known_hosts 删除对应的ip下的用户密匙
